penthera-; penthero-

(Greek: mother-in-law; father-in-law)

pentheraphilia
A love or fondness for one's mother-in-law and having her closely associated with the family.
pentheraphobia (s) (noun) (no plural)
A fear of one's mother-in-law: Jack was most anxious that his wife's mom would intrude in the affairs of their marriage or in their everyday life, like cooking and cleaning, and this irrational distress caused him to have pentheraphobia!
pentherophilia
A love or fondness for one's father-in-law and having him closely associated with the family.
pentherophobia (s) (noun) (no plural)
An intense dislike of one's father-in-law: Susan liked her husband's mom, but not his dad, fearing that he would intrude not only in the affairs of their marriage, but also in the upbringing of their children, and, suffering from the tension and stress this caused her, she developed pentherophobia.